Brake shoe



Patented ct. 1.8, 1932 UNITED STATES PATENT oFFlcE y Frrz WILLIAM sARGEN'r, or MAHWAH, NEW JERSEY, AssrefivoiaJv To THE"H AMERICAN BRAKE SHOE AND roUNDnY COMPANY, or, WILMINGTON," DELAWARE, A CORPORA- TION OF DELAWARE BRAKE SHQFEL f i Application med May s1, 1eso.' seria1 No. 458,793.

This invention relates to brake shoes and it has for its object broadly to reenforce and strengthen the shoe and to hold the parts of the body together in case of fracture.

Another object of the invention is to provide a strong and substantial reenforcing back which is embedded in the shoe at the back of the body and is constructed to make interlocking engagement with the body during the casting operation.

And a further object of the invention is to depress the back at the sides thereof between the middle portion and the end portions, and to provide these depressed portions with openings to receive the body metal during the casting operation, this construction providing a transverse truss effect for the back at the depressed portions and flat portions at the middle and at the ends of the back and providing a strong and substantial back which will resist the conditions of service tending to break the back.

In the accompanying drawing I have illustrated the invention in a simple embodiment of a common cast iron car shoe and referring thereto,

Fig. 1 is a plan view of the back showingV the outline of the body of the shoe in broken lines and omitting the lug strap and lug.

Fig. 2 is a side elevation of the back with the lug strap assembled therewith and with the body and attaching lug indicated in broken lines.

Fig. 3 is a longitudinal sectional view of the back on the line 3-3 of Fig. 1.

Figs. 4, 5 and 6 are transverse sectional views of the back on the lines 4 4, 5 5 and 6-6 respectively of Fig. 1.

Figs. 7 and 8 are transverse sectional views through the shoe on the lines 7 -7 and 8--8 respectively of Fig. 2.

Referring to the drawing the back 9 is formed from a single strip of sheet metal by bending and shaping a suitable blank and it is provided with a flat middle portion 10 and flat end portions 11. The side edges of the middle portion may be cut out at 12 to receive the lug strap 13 which is engaged therewith in any suitable manner. The cast metal of the body 14 runs up at the sides of thelug strap-to form with the strap the attaching lug 15. IThe flat middle portion 10V of the back preferably extends throughout the base of the attaching lug. y The flat end portions 11 of the back are provided with Vone or--more openings 16 through which the body metal flows to make anchoring engagement with the back. These openings are preferablyl of relatively large size to effect a secure anchoring engagement between the end portions of-the bodyand the end portions of the back whereby to hold the end portions vof the body on the back if the body is fractured. Between the flat middle portion 10 and each flat end portion 11 theback is depressed or dished at 17 at and adjacent its sideedges leaving a longitudinally eX- tending flat portion 18 between each pair of depressions. These depressions are preferably curved at their ends 19 and openings 20 are located in the depressions, these openings being preferably elongated in the form of slots. The depressions are of substantial width and extend almost to the longitudinal center of the back, leaving a narrow flat portion 18 which enlarges at its ends and merges into the flat portions 10 and 11 of the back. The reenforce back plate preferably has its side edges 21 beveled from the cut-outs 12v to the ends of the back and extending alongl the edges of the depressions 17. The body metal flows up through the openings 16 and at the ends of the` back to form the end stops 22 and end guides 23, and also flows through the openings 2O and seats in the de-I pressions 17 to interlock with the back; and the beveled edges 21 of the back also make interlocking engagement with the body. Thus the body is securely held on the back throughout the length of the back, and if the body fractures the parts thereof will be held together by the back so that the shoe mayr continue in service without substantial loss of efficiency. The oppositely disposed depressions at the ends of the back between the middle and end portions of the back form a transverse truss effect which materially strengthens the back; and the flat portion 10 beneath the attaching lug being free of openings and distortion retains its foriginal strength so that a back is provided of strong and substantial construction throughout its length and to which the body is securely anchored. If the body is fractured the parts thereof will be held in place by the back and the back Will resist the vibrations and other effects of service so that the shoe may continue in use until the body has Worn to the limit of Wear.

' l I haveshown the invention embodied in simple form of Solid cast iron oar shoe but it Will be readily understood that it may be embodied in other kinds of shoes, including composite shoes, Without .departing .from the invention; and I reserve the right to make Yany changes 1n the form, construction and arrangement of parts Within themsoope of the following claim.

I Claim:

A brake shoe omprisingv body, a cen- A tral Vattaching lug, and a reenforce back embedded in the body at the back thereof, said back Comprising a strip of less Width than the body and having elongated depressions at both side edges between the middle portion and the end portions of the back, there being openings in the bottom of said depressions to permit the body metal to run therethrough and into the depressions during the Casting operation Jfor filling the depressions and uniting with the body metal at the Vedges of the back to anohorthe back to the body.

FITZ WILLIAM SARGENT. 

